There was close to no space when we were running through the city in the final mission. The city Is already crowded. With the traveler awake again there's no place where the light doesn't touch so it's not like Guardians would get weaker if they were to expand and explore.
English
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You’ve only seen the city with cabal in it and never with any citizens. And some of them will have died during the cabal invasion
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But look at the city from the tower. In Both D1 and D2 there's is close to no space between buildings. With the Travelers return we have new possibilities.
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But how many people live in the last city?
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I don't Know you tell me
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So then we dont know if humans are able to expand right now
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And we don't know if we can't